A Pennsylvania pizza shop owner is in jail after he allegedly dumped live vermin in his competitors' restaurants in a case cops are calling "food terrorism by mice."

Nikolas Galiatsatos, 47, who owns Nina's Bella Pizzeria in Upper Darby walked into Verona Pizza, a few blocks away from his shop on Monday afternoon carrying a bag and asking to use the restroom.

When Fanis Facas, the owner of Verona's, went to inspect the bathroom after hearing a banging noise, he discovered footprints on the toilet and a bag tucked into the ceiling. He turned the bag over to two officers that happened to be eating in the restaurant.

Cops suspected it was a possible drug deal, but instead of finding drugs in the bag, they found several mice, according to the Delaware County Daily Times.

Galiatsatos was then seen walking across the street to Uncle Nick's Pizza. Cops said after he left the second pizza parlor they found another bag containing five living mice and one dead mouse in a trash can.

He was promptly arrested and now faces charges of criminal mischief, disorderly conduct, harassment and cruelty to animals.

Police Superintendent Michael Chitwood said Nina's Bella Pizzeria had only been opened for a short time. It wasn't doing well, which may have motivated Galiatsatos to sabotage nearby pizza parlors.

"We believe that he's trying to put the competitive pizza places out of business," Chitwood said.